19-0498; Rev 0; 3/98 ±15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers ____________________________Features ♦ ESD Protection: ±15kV—IEC 1000-4-2, Air-Gap Discharge ±8kV—IEC 1000-4-2, Contact Discharge ±15kV—Human Body Model ♦ Guaranteed Propagation-Delay Tolerance Between All ICs: ±8ns (MAX3095) ±10ns (MAX3096) ♦ Single +3V Operation (MAX3096) Single +5V Operation (MAX3095) ♦ 16-Pin QSOP (8-pin SO footprint) ♦ 10Mbps Data Rate ♦ Allow up to 128 Receivers on the Bus ♦ 1nA Low-Power Shutdown Mode ♦ 2.4mA Operating Supply Current ♦ Pin-Compatible Upgrades to ’26LS32 ________________________Applications Telecommunications Equipment Rugged RS-422/RS-485/RS-423 Bus Receiver Receivers for ESD-Sensitive Applications Level Translators ________________Functional Diagram VCC G _______________Ordering Information PART MAX3095CPE MAX3095CSE MAX3095CEE MAX3095EPE MAX3095ESE MAX3095EEE MAX3096CPE MAX3096CSE MAX3096CEE MAX3096EPE MAX3096ESE MAX3096EEE TEMP. RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -40°C to +85°C 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -40°C to +85°C MAX3095 MAX3096 G Pin Configuration A1 Y1 B1 A2 Y2 B2 TOP VIEW B1 1 16 VCC A1 2 15 B4 Y1 3 14 A4 G 4 A3 Y3 B3 A4 Y4 B4 Y2 5 MAX3095 MAX3096 13 Y4 12 G A2 6 11 Y3 B2 7 10 A3 9 GND 8 GND PIN-PACKAGE 16 Plastic DIP 16 Narrow SO 16 QSOP 16 Plastic DIP 16 Narrow SO 16 QSOP 16 Plastic DIP 16 Narrow SO 16 QSOP 16 Plastic DIP 16 Narrow SO 16 QSOP B3 DIP/SO/QSOP ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. MAX3095/MAX3096 ________________General Description The MAX3095/MAX3096 are rugged, low-power, quad, RS-422/RS-485 receivers with electrostatic discharge (ESD) protection for use in harsh environments. All receiver inputs are protected to ±15kV using IEC 10004-2 Air-Gap Discharge, ±8kV using IEC 1000-4-2 Contact Discharge, and ±15kV using the Human Body Model. The MAX3095 operates from a +5V supply, while the MAX3096 operates from a +3.3V supply. Receiver propagation delays are guaranteed to within ±8ns of a predetermined value, thereby ensuring device-to-device matching across production lots. Complementary enable inputs can be used to place the devices in a 1nA low-power shutdown mode in which the receiver outputs are high impedance. When active, these receivers have a fail-safe feature that guarantees a logic-high output if the input is open circuit. They also feature a quarter-unit-load input impedance that allows 128 receivers on a bus. The MAX3095/MAX3096 are pin-compatible, low-power upgrades to the industry-standard ’26LS32. They are available in a space-saving QSOP package. MAX3095/MAX3096 ±15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC) ...............................................................7V Control Input Voltage (G, G).......................-0.3V to (VCC + 0.3V) Receiver Input Voltage (A_, B_)...........................................±25V Receiver Output Voltage (Y_).....................-0.3V to (VCC + 0.3V) Continuous Power Dissipation (TA = +70°C) Plastic DIP (derate 10.5mW/°C above +70°C) ............762mW SO (derate 8.7mW/°C above +70°C) ...........................696mW QSOP (derate 8.3mW/°C above +70°C) ......................667mW Operating Temperature Ranges MAX309_C_ _ .....................................................0°C to +70°C MAX309_E_ _...................................................-40°C to +85°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10sec) .............................+300°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. DC ELECTRICAL CHARACTERISTICS—MAX3095 (VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Receiver Differential Input Threshold SYMBOL VTH Receiver Input Hysteresis Receiver Input Current (A_, B_) CONDITIONS MIN -7V ≤ VCM ≤ 12V -200 VCM = 0 IIN VCC = 0 or 5.25V TYP MAX UNITS 200 mV 45 mV VIN = 12V 250 VIN = -7V -200 Enable Input Current (G, G) ±1 Enable Input High Voltage (G, G) VIH Enable Input Low Voltage (G, G) VIL 2.0 µA µA V 0.8 V Receiver Output High Voltage VOH IOUT = -4mA, VID = 200mV, G = VCC or G = GND, Figure 1 Receiver Output Low Voltage VOL IOUT = 4mA, VID = -200mV, G = VCC or G = GND, Figure 1 0.4 V Three-State Current at Receiver Output IOZR 0 ≤ VOUT ≤ VCC, G = GND and G = VCC ±1 µA Output Short-Circuit Current IOSR 0 ≤ VOUT ≤ VCC, G = VCC or G = GND ±7 ±75 mA Receiver Input Resistance RIN -7V ≤ VCM ≤ 12V 48 2.4 3.5 mA 0.001 10 µA Supply Current ESD Protection (Note 2) 2 ICC No load, G = VCC or G = GND G = GND and G = VCC VCC - 1.5 V kΩ Human Body Model ±15 IEC1000-4-2 (Air-Gap Discharge) ±15 IEC1000-4-2 (Contact Discharge) ±8 _______________________________________________________________________________________ kV ±15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers (VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN VCC = 5V ±5%, TA = TMIN to TMAX Input-to-Output Propagation Delay tPLH, tPHL VCC = 5.25V |VID| = 3V, Figure 2 VCC = 4.75V Device-to-Device PropagationDelay Matching TYP MAX 65 UNITS 98 TA = +85°C 78 86 94 TA = +25°C 71 79 87 TA = -40°C 65 73 81 TA = +85°C 82 90 98 TA = +25°C 74 82 90 TA = -40°C 68 76 84 |VID| = 3V, Figure 2, matched conditions ns 16 ns -4 ±10 ns Propagation-Delay Skew (tPLH - tPHL) tSK Output Enable Time to Low Level tZL Figure 3 600 800 ns Output Enable Time to High Level tZH Figure 3 600 800 ns Output Disable Time from Low Level tLZ Figure 3 60 100 ns Output Disable Time from High Level tHZ Figure 3 60 100 ns Maximum Data Rate fMAX 10 Mbps DC ELECTRICAL CHARACTERISTICS—MAX3096 (VCC = 3.0V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 3.3V, TA = +25°C.) (Note 1) PARAMETER Receiver Differential Input Threshold SYMBOL VTH Receiver Input Hysteresis Receiver Input Current (A_, B_) CONDITIONS MIN -7V ≤ VCM ≤ 12V -200 VCM = 0 IIN VCC = 0 or 3.6V TYP MAX UNITS 200 mV 45 mV VIN = 12V 250 VIN = -7V -200 Enable Input Current (G, G) ±1 Enable Input High Voltage (G, G) VIH Enable Input Low Voltage (G, G) VIL 2.0 µA µA V 0.8 V Receiver Output High Voltage VOH IOUT = -1.5mA, VID = 200mV, G = VCC or G = GND, Figure 1 Receiver Output Low Voltage VOL IOUT = 2.5mA, VID = -200mV, G = VCC or G = GND, Figure 1 0.4 V Three-State Current at Receiver Output IOZR 0 ≤ VOUT ≤ VCC, G = GND and G = VCC ±1 µA Output Short-Circuit Current IOSR 0 ≤ VOUT ≤ VCC, G = VCC or G = GND ±4 ±60 mA Receiver Input Resistance RIN -7V ≤ VCM ≤ 12V 48 VCC - 0.4 V kΩ _______________________________________________________________________________________ 3 MAX3095/MAX3096 SWITCHING CHARACTERISTICS—MAX3095 MAX3095/MAX3096 ±15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers DC ELECTRICAL CHARACTERISTICS—MAX3096 (continued) (VCC = 3.0V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 3.3V, TA = +25°C.) (Note 1) PARAMETER Supply Current SYMBOL ICC ESD Protection (Note 2) CONDITIONS MIN No load, G = VCC or G = GND G = GND and G = VCC TYP MAX UNITS 2.4 4.0 mA 0.001 10 µA Human Body Model ±15 IEC1000-4-2 (Air-Gap Discharge) ±15 IEC1000-4-2 (Contact Discharge) ±8 kV SWITCHING CHARACTERISTICS—MAX3096 (VCC = 3.0V to 3.6V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN VCC = 3.0V to 3.6V, TA = TMIN to TMAX Input-to-Output Propagation Delay tPLH, tPHL VCC = 3.60V |VID| = 3V, Figure 2 VCC = 3.00V Device-to-Device PropagationDelay Matching TYP 69 MAX 123 TA = +85°C 88 98 108 TA = +25°C 78 88 98 TA = -40°C 69 79 89 TA = +85°C 103 113 123 TA = +25°C 91 101 111 TA = -40°C 82 92 102 |VID| = 3V, Figure 2, matched conditions ns 20 ns -2 ±10 ns Propagation-Delay Skew (tPLH - tPHL) tSK Output Enable Time to Low Level tZL Figure 3 600 1000 ns Output Enable Time to High Level tZH Figure 3 600 1000 ns Output Disable Time from Low Level tLZ Figure 3 80 180 ns Output Disable Time from High Level tHZ Figure 3 80 180 ns Maximum Data Rate fMAX 10 Note 1: All currents into the device are positive; all currents out of the device are negative. All voltages are referred to device ground, unless otherwise noted. Note 2: Receiver inputs (A_, B_). 4 UNITS _______________________________________________________________________________________ Mbps ±15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers 25 OUTPUT CURRENT (mA) -40 -30 -20 MAX3096 MAX3095 20 0.9 OUTPUT LOW VOLTAGE (V) MAX3095 1.0 MAX3095-02 30 MAX3095-01 -50 OUTPUT CURRENT (mA) OUTPUT LOW VOLTAGE vs. TEMPERATURE OUTPUT CURRENT vs. OUTPUT HIGH VOLTAGE 15 10 MAX3096 -10 MAX3095-03 OUTPUT CURRENT vs. OUTPUT LOW VOLTAGE IOUT = 8mA 0.8 0.7 0.6 0.5 0.4 MAX3096 0.3 MAX3095 0.2 5 0.1 1 2 3 4 5 1 2 3 4 -40 5 -15 10 35 60 OUTPUT LOW VOLTAGE (V) OUTPUT HIGH VOLTAGE (V) TEMPERATURE (°C) OUTPUT HIGH VOLTAGE vs. TEMPERATURE SUPPLY CURRENT vs. TEMPERATURE SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE 4 SUPPLY CURRENT (mA) 2.8 3 MAX3096 2 1 2.6 MAX3095/MAX3096 2.4 2.2 20 85 MAX3095-06 MAX3095 SHUTDOWN SUPPLY CURRENT (nA) 3.0 MAX3095-04 5 15 10 MAX3095 MAX3096 5 IOUT = -8mA 2.0 35 60 85 0 -40 -15 TEMPERATURE (°C) 10 35 60 -40 -15 TEMPERATURE (°C) VID = 3V CL = 15pF 110 100 90 80 10 35 60 85 TEMPERATURE (°C) MAX3095 PROPAGATION DELAY vs. TEMPERATURE 120 85 MAX3096 PROPAGATION DELAY vs. TEMPERATURE 140 130 MAX3095-08 10 PROPAGATION DELAY (ns) -15 MAX3095-07 -40 PROPAGATION DELAY (ns) OUTPUT HIGH VOLTAGE (V) 0 MAX3095-05 0 0 0 0 0 VID = 3V CL = 15pF 120 110 100 90 70 80 -40 -15 10 35 TEMPERATURE (°C) 60 85 -40 -15 10 35 60 85 TEMPERATURE (°C) _______________________________________________________________________________________ 5 MAX3095/MAX3096 Typical Operating Characteristics (VCC = 5V for MAX3095, VCC = 3.3V for MAX3096, TA = +25°C, unless otherwise noted.) MAX3095/MAX3096 ±15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers Typical Operating Characteristics (continued) (VCC = 5V for MAX3095, VCC = 3.3V for MAX3096, TA = +25°C, unless otherwise noted.) SHUTDOWN TIMING MAX3095 TOC09 MAX3095 Y VOLTAGE 5V/div 2V/div MAX3096 Y VOLTAGE G VOLTAGE 2V/div TIME (200ns/div) CIRCUIT OF FIGURE 3, S1 OPEN, S2 CLOSED, S3 = 1V Pin Description 6 PIN NAME FUNCTION 1 B1 Inverting Receiver Input 2 A1 Noninverting Receiver Input 3 Y1 Receiver Output. Enabled when G = high OR G = low. Y1 will be logic high if A1 > B1 by 200mV, and low if A1 < B1 by 200mV. It will be logic high if A1 and B1 remain floating. Otherwise, the state is undetermined. Y1 goes high impedance when the G = low and G = high. 4 G Receiver Output Enable High. A logic high on this input enables all receivers. When taken low and G is high, all receivers are shut down, and the outputs go high impedance. 5 Y2 Receiver Output. Same functionality as Y1. 6 A2 Noninverting Receiver Input 7 B2 Inverting Receiver Input 8 GND 9 B3 Inverting Receiver Input 10 A3 Noninverting Receiver Input 11 Y3 Receiver Output. Same functionality as Y1. 12 G Receiver Output Enable Low. A logic low on this pin enables all receivers. When G = high and G = low, all receivers are shut down, and the outputs go high impedance. 13 Y4 Receiver Output. Same functionality as Y1. 14 A4 Noninverting Receiver Input 15 B4 Inverting Receiver Input 16 VCC Ground Positive Supply _______________________________________________________________________________________ ±15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers VID MAX3095/MAX3096 |VID| = 3V OUT R CL 15pF VID R G = VCC or G = GND VOL VOH IOL (+) IOH (-) 3.0V IN 1.5V 1.5V 0V tPHL tPLH VCC Figure 1. Receiver VOH and VOL 1.5V OUT 1.5V 0V Figure 2. Receiver Propagation Delay VCC S1 S3 +1V G -1V VID VCC 1k R S2 CL 15pF G 3V G 1.5V 1.5V 3V G 0 tZH 0 tHZ tLZ tZL VCC VOH OUT 0.25V OUT 1.5V 1.5V VOL 0 S1 OPEN S2 CLOSED S3 = 1V 0.25V S1 CLOSED S2 OPEN S3 = -1V Figure 3. Receiver Enable and Disable Times _______________________________________________________________________________________ 7 MAX3095/MAX3096 ±15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers _______________Detailed Description ±15kV ESD Protection As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges (ESD) encountered during handling and assembly. The MAX3095/MAX3096 receiver inputs have extra protection against static electricity found in normal operation. Maxim’s engineers developed stateof-the-art structures to protect these pins against ±15kV ESD, without damage. After an ESD event, the MAX3095/ MAX3096 continue working without latchup. ESD protection can be tested in several ways. The receiver inputs are characterized for protection to the following: 1) ±15kV using the Human Body Model 2) ±8kV using the Contact-Discharge Method specified in IEC 1000-4-2 (formerly IEC 801-2) 3) ±15kV using the Air-Gap Method specified in IEC 1000-4-2 (formerly IEC 801-2) ESD Test Conditions ESD performance depends on a number of conditions. Contact Maxim for a reliability report that documents test setup, methodology, and results. Human Body Model Figure 4a shows the Human Body Model, and Figure 4b shows the current waveform it generates when discharged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the device through a 1.5kΩ resistor. IEC 1000-4-2 Since January 1996, all equipment manufactured and/or sold in the European community has been required to meet the stringent IEC 1000-4-2 specification. The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifically refer to integrated circuits. The MAX3095/MAX3096 help you design equipment that meets Level 4 (the highest level) of IEC 1000-4-2, without additional ESD-protection components. 8 The main difference between tests done using the Human Body Model and IEC 1000-4-2 is higher peak current in IEC 1000-4-2. Because series resistance is lower in the IEC 1000-4-2 ESD test model (Figure 5a), the ESD-withstand voltage measured to this standard is generally lower than that measured using the Human Body Model. Figure 5b shows the current waveform for the ±8kV IEC 1000-4-2 Level 4 ESD Contact-Discharge test. The Air-Gap test involves approaching the device with a charge probe. The Contact-Discharge method connects the probe to the device before the probe is energized. Machine Model The Machine Model for ESD testing uses a 200pF storage capacitor and zero-discharge resistance. It mimics the stress caused by handling during manufacturing and assembly. Of course, all pins (not just RS-485 inputs) require this protection during manufacturing. Therefore, the Machine Model is less relevant to the I/O ports than are the Human Body Model and IEC 1000-4-2. Low-Power Shutdown Mode Table 1 shows the functionality of the enable inputs. The MAX3095/MAX3096 enter shutdown when G is low and G is high. In shutdown, all outputs go high impedance and the devices typically draw less than 1nA. The devices exit shutdown by taking G high or G low. The typical shutdown exit time is 600ns. Table 1. Function Table (A - B) OUTPUT Y DEVICE MODE X ≥ 200mV 1 On X ≤ -200mV 0 On 1 X Open 1 On X 0 ≥ 200mV 1 On X 0 ≤ -200mV 0 On X 0 Open 1 On 0 1 X High-Z Shutdown G G 1 1 X = don’t care, High-Z = high impedance _______________________________________________________________________________________ ±15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE Cs 100pF IP 100% 90% DISCHARGE RESISTANCE STORAGE CAPACITOR Ir DEVICE UNDER TEST Figure 4a. Human Body ESD Test Model 36.8% 10% 0 HIGHVOLTAGE DC SOURCE Cs 150pF tDL CURRENT WAVEFORM Figure 4b. Human Body Model Current Waveform RD 330Ω I 100% 90% DISCHARGE RESISTANCE STORAGE CAPACITOR TIME tRL IPEAK CHARGE-CURRENT LIMIT RESISTOR PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) AMPERES 0 RC 50M to 100M MAX3095/MAX3096 RD 1.5k RC 1M DEVICE UNDER TEST 10% tr = 0.7ns to 1ns t 30ns 60ns Figure 5a. IEC 1000-4-2 ESD Test Model Figure 5b. IEC 1000-4-2 ESD-Generator Current Waveform _______________________________________________________________________________________ 9 MAX3095/MAX3096 ±15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers Applications Information Propagation-Delay Matching The MAX3095/MAX3096 exhibit propagation delays that are closely matched from one device to another, even between devices from different production lots. This feature allows multiple data lines to receive data and clock signals with minimal skewing with respect to each other. The MAX3095 receiver propagation delays are trimmed to a predetermined value ±8ns, while the MAX3096 delays are trimmed to a predetermined value ±10ns. VCC 1k A MAX3095 MAX3096 150Ω 128 Receivers on the Bus The standard RS-485 input impedance is 12kΩ (oneunit load). The standard RS-485 transmitter can drive 32 unit loads. The MAX3095/MAX3096 present a 1/4unit-load input impedance (48kΩ), which allows up to 128 receivers on a bus. Any combination of these RS485 receivers with a total of 32 unit loads can be connected to the same bus. Fail-Safe Implementation The MAX3095/MAX3096 receiver inputs guarantee a logic high output when the inputs are open circuit (no termination resistor used). This occurs when the transmitter is removed from the bus or when all transmitter outputs are high impedance. However, when the line is terminated and the transmitters are disabled, the differential voltage between the A and B inputs falls below the ±200mV RS-485 sensitivity threshold. Consequently, the outputs become undefined. To maintain a failsafe receiver output while using a terminating resistor, input A must be biased at least 200mV above input B. The resistor-divider network shown in Figure 6 is recommended. 10 B 1k Figure 6. External Fail-Safe Implementation Chip Information TRANSISTOR COUNT: 676 ______________________________________________________________________________________ ±15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers QSOP.EPS ______________________________________________________________________________________ 11 MAX3095/MAX3096 Package Information ±15kV ESD-Protected, 10Mbps, 3V/5V, Quad RS-422/RS-485 Receivers PDIPN.EPS SOICN.EPS MAX3095/MAX3096 Package Information (continued) Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.